diff --git a/tools/config/__init__.py b/tools/config/__init__.py
index 747692eb35..16df46b8dd 100644
--- a/tools/config/__init__.py
+++ b/tools/config/__init__.py
@@ -543,7 +543,6 @@ class Config(object):
             # Check that we didn't already process this file
             if full_path in self.processed_configs:
                 continue
-            self.processed_configs[full_path] = True
             # Read the library configuration and add a "__full_config_path"
             # attribute to it
             try:
@@ -568,6 +567,13 @@ class Config(object):
                 raise ConfigException("; ".join(
                     self.format_validation_error(x, config_file)
                     for x in errors))
+            if (
+                "requires" in self.app_config_data
+                and cfg["name"] not in self.app_config_data["requires"]
+            ):
+                continue
+
+            self.processed_configs[full_path] = True
 
             cfg["__config_path"] = full_path
 
diff --git a/tools/config/definitions.json b/tools/config/definitions.json
index a6f71dcc61..e41fbbe4b8 100644
--- a/tools/config/definitions.json
+++ b/tools/config/definitions.json
@@ -6,6 +6,14 @@
       "type": "string"
     }
   },
+  "requires_definition": {
+    "descirption": "Required libraries",
+    "type": "array",
+    "items": {
+      "type": "string",
+      "pattern": "(^[\\w()_]+$|^[\\w()_]+=.+$)"
+    }
+  },
   "macro_definition": {
     "description": "A list of extra macros that will be defined when compiling a project that includes this library.",
     "type": "array",
diff --git a/tools/config/schema_app.json b/tools/config/schema_app.json
index 981100ce59..dee7061c53 100644
--- a/tools/config/schema_app.json
+++ b/tools/config/schema_app.json
@@ -16,6 +16,9 @@
     "macros": {
       "$ref": "definitions.json#/macro_definition"
     },
+    "requires": {
+      "$ref": "definitions.json#/requires_definition"
+    },
     "artifact_name": {
       "type": "string"
     }
diff --git a/tools/config/schema_lib.json b/tools/config/schema_lib.json
index b8556c961e..b4106c4952 100644
--- a/tools/config/schema_lib.json
+++ b/tools/config/schema_lib.json
@@ -13,6 +13,9 @@
     "target_overrides": {
       "$ref": "definitions.json#/target_overrides_definition"
     },
+    "requires": {
+      "$ref": "definitions.json#/requires_definition"
+    },
     "macros": {
       "$ref": "definitions.json#/macro_definition"
     }